dmaengine: ioat: adding missed issue_pending to timeout handler

completion timeout might trigger unnesesery DMA engine hw reboot
in case of missed issue_pending() .

Acked-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Leonid Ravich <Leonid.Ravich@emc.com>
Link: https://lore.kernel.org/r/1587589761-32690-3-git-send-email-leonid.ravich@dell.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>